AcdbObject::upgradeOpen()出现的问题！
<P>当用AcdbObject::upgradeOpen()将一个层表记录改为 kforwrite时，提示Acad::eHadMultipleReaders,无法改变其读写的状态</P><P>只有用->close()函数关闭层表记录，再执行upgradeOpen() ，操作成功。</P>
<P>是不是运用upgradeOpen() 前必须关闭对象呢？</P>
<P>但是我在另外一个工程中却没有这样的问题，不解！请高手指教，呵呵。。。</P> <P>Acad::ErrorStatus</P>
<P>upgradeOpen();</P>
<P>If the object is currently open AcDb::kForRead with only one reader, then this function upgrades the object to open AcDb::kForWrite. In the process of changing to open for write, the object is closed, thus triggering any pertinent notification.<BR>Returns Acad::eOk if successful. If the object has more than one reader, then the open status is not changed and Adesk::eHadMultipleReaders is returned. If the object is already open AcDb::kForWrite, then Acad::eWasOpenForWrite is returned. If the object is currently sending notification, then the open status is not changed and Acad::eWasNotifying is returned.</P>
<P>Note A call of this function does not need to be matched with a call to downgradeOpen(), since a call to close() or cancel() will sufficiently cleanup the entity抯 open state.</P>
<P>注意这个函数中的说明 If the object has more than one reader, then the open status is not changed and Adesk::eHadMultipleReaders is returned</P> <P>没有啊，层表记录只有在获得层表记录时以kForRead模式打开的，然后马上用upgradeOpen()函数将其改为kForWrite状态。应该是没有问题的。</P>
<P>还有一个问题是：同是这个程序，放在另外一个工程中并没有这样的问题，百思不得其解。</P> <P>不好意思，我是现在还是菜鸟，还有很多的问题不懂呢....</P>
<P>望有达人们来解决吧</P> <P>我还未为达人，建议看看帮助文件</P>
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